Re: [Patch] Step2: don't use _M_out_lim in filebuf, have filebufnon unified, etc...

[Paolo Carlini <pcarlini at unitus dot it>]

Nathan Myers wrote:

> > Anyway, *right now*, on my P4, for 9876
> >
> > 1.990u 0.370s 0:02.37 99.5%     0+0k 0+0io 215pf+0w   (stdio unlocked)
> > 1.480u 0.380s 0:01.94 95.8%     0+0k 0+0io 216pf+0w   (iostream)
> >    
> I ran another benchmark, attached below, on several compilers
> on P3 and Opteron.  All builds are -O2.
Thanks Nathan. I can reproduce you results here, with my P4. Therefore I 
would be tempted to move right away sputc, sbumpc (and also, perhaps, 
sungetc and sputbackc).

An additional puzzling data point, however: have you tried moving _only_ 
sbumpc to std_streambuf.h vs moving both sbumpc and sputc?

Here, if both are moved 9876 regresses to the pre-patch performance...

Paolo.